blob: da83982bf974c5d84d8046b7b415b4f2f1b07cb9 [file] [log] [blame]
Simon Wunderliche19f9752014-01-04 18:04:25 +01001/* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00002 *
3 * Marek Lindner, Simon Wunderlich
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
Antonio Quartulliebf38fb2013-11-03 20:40:48 +010015 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000016 */
17
18#include "main.h"
19#include "routing.h"
20#include "send.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000021#include "soft-interface.h"
22#include "hard-interface.h"
23#include "icmp_socket.h"
24#include "translation-table.h"
25#include "originator.h"
Simon Wunderlich23721382012-01-22 20:00:19 +010026#include "bridge_loop_avoidance.h"
Antonio Quartullic384ea32011-06-26 03:37:18 +020027#include "distributed-arp-table.h"
Martin Hundebøll95332472013-01-25 11:12:40 +010028#include "network-coding.h"
Martin Hundebøll610bfc6bc2013-05-23 16:53:02 +020029#include "fragmentation.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000030
Antonio Quartullic018ad32013-06-04 12:11:39 +020031#include <linux/if_vlan.h>
32
Sven Eckelmann63b01032012-05-16 20:23:13 +020033static int batadv_route_unicast_packet(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +020034 struct batadv_hard_iface *recv_if);
Simon Wunderlicha7f6ee92012-01-22 20:00:18 +010035
Simon Wunderlich7351a4822013-11-13 19:14:47 +010036/**
37 * _batadv_update_route - set the router for this originator
38 * @bat_priv: the bat priv with all the soft interface information
39 * @orig_node: orig node which is to be configured
40 * @recv_if: the receive interface for which this route is set
41 * @neigh_node: neighbor which should be the next router
42 *
43 * This function does not perform any error checks
44 */
Sven Eckelmann56303d32012-06-05 22:31:31 +020045static void _batadv_update_route(struct batadv_priv *bat_priv,
46 struct batadv_orig_node *orig_node,
Simon Wunderlich7351a4822013-11-13 19:14:47 +010047 struct batadv_hard_iface *recv_if,
Sven Eckelmann56303d32012-06-05 22:31:31 +020048 struct batadv_neigh_node *neigh_node)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000049{
Simon Wunderlich7351a4822013-11-13 19:14:47 +010050 struct batadv_orig_ifinfo *orig_ifinfo;
Sven Eckelmann56303d32012-06-05 22:31:31 +020051 struct batadv_neigh_node *curr_router;
Linus Lüssinge1a5382f2011-03-14 22:43:37 +000052
Simon Wunderlich7351a4822013-11-13 19:14:47 +010053 orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if);
54 if (!orig_ifinfo)
55 return;
56
57 rcu_read_lock();
58 curr_router = rcu_dereference(orig_ifinfo->router);
59 if (curr_router && !atomic_inc_not_zero(&curr_router->refcount))
60 curr_router = NULL;
61 rcu_read_unlock();
Marek Lindnera8e7f4b2010-12-12 21:57:10 +000062
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000063 /* route deleted */
Linus Lüssinge1a5382f2011-03-14 22:43:37 +000064 if ((curr_router) && (!neigh_node)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +020065 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
66 "Deleting route towards: %pM\n", orig_node->orig);
Antonio Quartulli95fb1302013-08-07 18:28:55 +020067 batadv_tt_global_del_orig(bat_priv, orig_node, -1,
Sven Eckelmann08c36d32012-05-12 02:09:39 +020068 "Deleted route towards originator");
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000069
Linus Lüssinge1a5382f2011-03-14 22:43:37 +000070 /* route added */
71 } else if ((!curr_router) && (neigh_node)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +020072 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +020073 "Adding route towards: %pM (via %pM)\n",
74 orig_node->orig, neigh_node->addr);
Linus Lüssinge1a5382f2011-03-14 22:43:37 +000075 /* route changed */
Sven Eckelmannbb899b82011-05-10 11:22:37 +020076 } else if (neigh_node && curr_router) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +020077 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +020078 "Changing route towards: %pM (now via %pM - was via %pM)\n",
79 orig_node->orig, neigh_node->addr,
80 curr_router->addr);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000081 }
82
Linus Lüssinge1a5382f2011-03-14 22:43:37 +000083 if (curr_router)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +020084 batadv_neigh_node_free_ref(curr_router);
Linus Lüssinge1a5382f2011-03-14 22:43:37 +000085
86 /* increase refcount of new best neighbor */
Marek Lindner44524fc2011-02-10 14:33:53 +000087 if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
88 neigh_node = NULL;
Linus Lüssinge1a5382f2011-03-14 22:43:37 +000089
90 spin_lock_bh(&orig_node->neigh_list_lock);
Simon Wunderlich7351a4822013-11-13 19:14:47 +010091 rcu_assign_pointer(orig_ifinfo->router, neigh_node);
Linus Lüssinge1a5382f2011-03-14 22:43:37 +000092 spin_unlock_bh(&orig_node->neigh_list_lock);
Simon Wunderlich7351a4822013-11-13 19:14:47 +010093 batadv_orig_ifinfo_free_ref(orig_ifinfo);
Linus Lüssinge1a5382f2011-03-14 22:43:37 +000094
95 /* decrease refcount of previous best neighbor */
96 if (curr_router)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +020097 batadv_neigh_node_free_ref(curr_router);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000098}
99
Simon Wunderlich7351a4822013-11-13 19:14:47 +0100100/**
101 * batadv_update_route - set the router for this originator
102 * @bat_priv: the bat priv with all the soft interface information
103 * @orig_node: orig node which is to be configured
104 * @recv_if: the receive interface for which this route is set
105 * @neigh_node: neighbor which should be the next router
106 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200107void batadv_update_route(struct batadv_priv *bat_priv,
108 struct batadv_orig_node *orig_node,
Simon Wunderlich7351a4822013-11-13 19:14:47 +0100109 struct batadv_hard_iface *recv_if,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200110 struct batadv_neigh_node *neigh_node)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000111{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200112 struct batadv_neigh_node *router = NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000113
114 if (!orig_node)
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000115 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000116
Simon Wunderlich7351a4822013-11-13 19:14:47 +0100117 router = batadv_orig_router_get(orig_node, recv_if);
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000118
119 if (router != neigh_node)
Simon Wunderlich7351a4822013-11-13 19:14:47 +0100120 _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node);
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000121
122out:
123 if (router)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200124 batadv_neigh_node_free_ref(router);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000125}
126
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000127/* checks whether the host restarted and is in the protection time.
128 * returns:
129 * 0 if the packet is to be accepted
130 * 1 if the packet is to be ignored.
131 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200132int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff,
Sven Eckelmann30d3c512012-05-12 02:09:36 +0200133 unsigned long *last_reset)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000134{
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200135 if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE ||
136 seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) {
137 if (!batadv_has_timed_out(*last_reset,
138 BATADV_RESET_PROTECTION_MS))
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000139 return 1;
Marek Lindner8c7bf242012-03-17 15:28:33 +0800140
141 *last_reset = jiffies;
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200142 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200143 "old packet received, start protection\n");
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000144 }
Marek Lindner8c7bf242012-03-17 15:28:33 +0800145
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000146 return 0;
147}
148
Sven Eckelmann30d3c512012-05-12 02:09:36 +0200149bool batadv_check_management_packet(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200150 struct batadv_hard_iface *hard_iface,
Sven Eckelmann30d3c512012-05-12 02:09:36 +0200151 int header_len)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000152{
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000153 struct ethhdr *ethhdr;
154
155 /* drop packet if it has not necessary minimum size */
Marek Lindnerc3e29312012-03-04 16:56:25 +0800156 if (unlikely(!pskb_may_pull(skb, header_len)))
157 return false;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000158
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200159 ethhdr = eth_hdr(skb);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000160
161 /* packet with broadcast indication but unicast recipient */
162 if (!is_broadcast_ether_addr(ethhdr->h_dest))
Marek Lindnerc3e29312012-03-04 16:56:25 +0800163 return false;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000164
165 /* packet with broadcast sender address */
166 if (is_broadcast_ether_addr(ethhdr->h_source))
Marek Lindnerc3e29312012-03-04 16:56:25 +0800167 return false;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000168
169 /* create a copy of the skb, if needed, to modify it. */
170 if (skb_cow(skb, 0) < 0)
Marek Lindnerc3e29312012-03-04 16:56:25 +0800171 return false;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000172
173 /* keep skb linear */
174 if (skb_linearize(skb) < 0)
Marek Lindnerc3e29312012-03-04 16:56:25 +0800175 return false;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000176
Marek Lindnerc3e29312012-03-04 16:56:25 +0800177 return true;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000178}
179
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200180/**
181 * batadv_recv_my_icmp_packet - receive an icmp packet locally
182 * @bat_priv: the bat priv with all the soft interface information
183 * @skb: icmp packet to process
184 *
185 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
186 * otherwise.
187 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200188static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200189 struct sk_buff *skb)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000190{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200191 struct batadv_hard_iface *primary_if = NULL;
192 struct batadv_orig_node *orig_node = NULL;
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200193 struct batadv_icmp_header *icmph;
194 int res, ret = NET_RX_DROP;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000195
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200196 icmph = (struct batadv_icmp_header *)skb->data;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000197
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200198 switch (icmph->msg_type) {
199 case BATADV_ECHO_REPLY:
200 case BATADV_DESTINATION_UNREACHABLE:
201 case BATADV_TTL_EXCEEDED:
202 /* receive the packet */
203 if (skb_linearize(skb) < 0)
204 break;
205
206 batadv_socket_receive_packet(icmph, skb->len);
207 break;
208 case BATADV_ECHO_REQUEST:
209 /* answer echo request (ping) */
210 primary_if = batadv_primary_if_get_selected(bat_priv);
211 if (!primary_if)
212 goto out;
213
214 /* get routing information */
215 orig_node = batadv_orig_hash_find(bat_priv, icmph->orig);
216 if (!orig_node)
217 goto out;
218
219 /* create a copy of the skb, if needed, to modify it. */
220 if (skb_cow(skb, ETH_HLEN) < 0)
221 goto out;
222
223 icmph = (struct batadv_icmp_header *)skb->data;
224
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100225 ether_addr_copy(icmph->dst, icmph->orig);
226 ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr);
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200227 icmph->msg_type = BATADV_ECHO_REPLY;
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100228 icmph->ttl = BATADV_TTL;
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200229
230 res = batadv_send_skb_to_orig(skb, orig_node, NULL);
231 if (res != NET_XMIT_DROP)
232 ret = NET_RX_SUCCESS;
233
234 break;
235 default:
236 /* drop unknown type */
Marek Lindner44524fc2011-02-10 14:33:53 +0000237 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000238 }
Marek Lindner44524fc2011-02-10 14:33:53 +0000239out:
Marek Lindner32ae9b22011-04-20 15:40:58 +0200240 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200241 batadv_hardif_free_ref(primary_if);
Marek Lindner44524fc2011-02-10 14:33:53 +0000242 if (orig_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200243 batadv_orig_node_free_ref(orig_node);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000244 return ret;
245}
246
Sven Eckelmann56303d32012-06-05 22:31:31 +0200247static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
Sven Eckelmann63b01032012-05-16 20:23:13 +0200248 struct sk_buff *skb)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000249{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200250 struct batadv_hard_iface *primary_if = NULL;
251 struct batadv_orig_node *orig_node = NULL;
Sven Eckelmann96412692012-06-05 22:31:30 +0200252 struct batadv_icmp_packet *icmp_packet;
Marek Lindner44524fc2011-02-10 14:33:53 +0000253 int ret = NET_RX_DROP;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000254
Sven Eckelmann96412692012-06-05 22:31:30 +0200255 icmp_packet = (struct batadv_icmp_packet *)skb->data;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000256
257 /* send TTL exceeded if packet is an echo request (traceroute) */
Antonio Quartulli27a417e2013-12-05 15:33:00 +0100258 if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
Sven Eckelmann86ceb362012-03-07 09:07:45 +0100259 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
Antonio Quartulli27a417e2013-12-05 15:33:00 +0100260 icmp_packet->orig, icmp_packet->dst);
Marek Lindner44524fc2011-02-10 14:33:53 +0000261 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000262 }
263
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200264 primary_if = batadv_primary_if_get_selected(bat_priv);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200265 if (!primary_if)
Marek Lindner44524fc2011-02-10 14:33:53 +0000266 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000267
268 /* get routing information */
Antonio Quartulli27a417e2013-12-05 15:33:00 +0100269 orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
Marek Lindner44524fc2011-02-10 14:33:53 +0000270 if (!orig_node)
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000271 goto out;
Marek Lindner44524fc2011-02-10 14:33:53 +0000272
Marek Lindner44524fc2011-02-10 14:33:53 +0000273 /* create a copy of the skb, if needed, to modify it. */
Antonio Quartulli0d125072012-02-18 11:27:34 +0100274 if (skb_cow(skb, ETH_HLEN) < 0)
Marek Lindner44524fc2011-02-10 14:33:53 +0000275 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000276
Sven Eckelmann96412692012-06-05 22:31:30 +0200277 icmp_packet = (struct batadv_icmp_packet *)skb->data;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000278
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100279 ether_addr_copy(icmp_packet->dst, icmp_packet->orig);
280 ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr);
Antonio Quartulli27a417e2013-12-05 15:33:00 +0100281 icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
282 icmp_packet->ttl = BATADV_TTL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000283
Martin Hundebølle91ecfc2013-04-20 13:54:39 +0200284 if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
Martin Hundebøllbb351ba2012-10-16 16:13:48 +0200285 ret = NET_RX_SUCCESS;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000286
Marek Lindner44524fc2011-02-10 14:33:53 +0000287out:
Marek Lindner32ae9b22011-04-20 15:40:58 +0200288 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200289 batadv_hardif_free_ref(primary_if);
Marek Lindner44524fc2011-02-10 14:33:53 +0000290 if (orig_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200291 batadv_orig_node_free_ref(orig_node);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000292 return ret;
293}
294
Sven Eckelmann56303d32012-06-05 22:31:31 +0200295int batadv_recv_icmp_packet(struct sk_buff *skb,
296 struct batadv_hard_iface *recv_if)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000297{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200298 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200299 struct batadv_icmp_header *icmph;
300 struct batadv_icmp_packet_rr *icmp_packet_rr;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000301 struct ethhdr *ethhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200302 struct batadv_orig_node *orig_node = NULL;
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200303 int hdr_size = sizeof(struct batadv_icmp_header);
Marek Lindner44524fc2011-02-10 14:33:53 +0000304 int ret = NET_RX_DROP;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000305
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000306 /* drop packet if it has not necessary minimum size */
307 if (unlikely(!pskb_may_pull(skb, hdr_size)))
Marek Lindner44524fc2011-02-10 14:33:53 +0000308 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000309
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200310 ethhdr = eth_hdr(skb);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000311
312 /* packet with unicast indication but broadcast recipient */
313 if (is_broadcast_ether_addr(ethhdr->h_dest))
Marek Lindner44524fc2011-02-10 14:33:53 +0000314 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000315
316 /* packet with broadcast sender address */
317 if (is_broadcast_ether_addr(ethhdr->h_source))
Marek Lindner44524fc2011-02-10 14:33:53 +0000318 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000319
320 /* not for me */
Antonio Quartullife8a93b2013-04-03 19:10:26 +0200321 if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
Marek Lindner44524fc2011-02-10 14:33:53 +0000322 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000323
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200324 icmph = (struct batadv_icmp_header *)skb->data;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000325
326 /* add record route information if not full */
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200327 if ((icmph->msg_type == BATADV_ECHO_REPLY ||
328 icmph->msg_type == BATADV_ECHO_REQUEST) &&
329 (skb->len >= sizeof(struct batadv_icmp_packet_rr))) {
330 if (skb_linearize(skb) < 0)
331 goto out;
332
333 /* create a copy of the skb, if needed, to modify it. */
334 if (skb_cow(skb, ETH_HLEN) < 0)
335 goto out;
336
337 icmph = (struct batadv_icmp_header *)skb->data;
338 icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph;
339 if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN)
340 goto out;
341
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100342 ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur],
343 ethhdr->h_dest);
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200344 icmp_packet_rr->rr_cur++;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000345 }
346
347 /* packet for me */
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200348 if (batadv_is_my_mac(bat_priv, icmph->dst))
349 return batadv_recv_my_icmp_packet(bat_priv, skb);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000350
351 /* TTL exceeded */
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100352 if (icmph->ttl < 2)
Sven Eckelmann63b01032012-05-16 20:23:13 +0200353 return batadv_recv_icmp_ttl_exceeded(bat_priv, skb);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000354
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000355 /* get routing information */
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200356 orig_node = batadv_orig_hash_find(bat_priv, icmph->dst);
Marek Lindner44524fc2011-02-10 14:33:53 +0000357 if (!orig_node)
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000358 goto out;
Marek Lindner44524fc2011-02-10 14:33:53 +0000359
Marek Lindner44524fc2011-02-10 14:33:53 +0000360 /* create a copy of the skb, if needed, to modify it. */
Antonio Quartulli0d125072012-02-18 11:27:34 +0100361 if (skb_cow(skb, ETH_HLEN) < 0)
Marek Lindner44524fc2011-02-10 14:33:53 +0000362 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000363
Simon Wunderlichda6b8c22013-10-22 22:50:09 +0200364 icmph = (struct batadv_icmp_header *)skb->data;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000365
Marek Lindner44524fc2011-02-10 14:33:53 +0000366 /* decrement ttl */
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100367 icmph->ttl--;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000368
Marek Lindner44524fc2011-02-10 14:33:53 +0000369 /* route it */
Martin Hundebølle91ecfc2013-04-20 13:54:39 +0200370 if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP)
Martin Hundebøllbb351ba2012-10-16 16:13:48 +0200371 ret = NET_RX_SUCCESS;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000372
Marek Lindner44524fc2011-02-10 14:33:53 +0000373out:
Marek Lindner44524fc2011-02-10 14:33:53 +0000374 if (orig_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200375 batadv_orig_node_free_ref(orig_node);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000376 return ret;
377}
378
Martin Hundebøllf86ce0a2013-01-14 00:20:32 +0100379/**
380 * batadv_check_unicast_packet - Check for malformed unicast packets
David S. Miller6e0895c2013-04-22 20:32:51 -0400381 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebøllf86ce0a2013-01-14 00:20:32 +0100382 * @skb: packet to check
383 * @hdr_size: size of header to pull
384 *
385 * Check for short header and bad addresses in given packet. Returns negative
386 * value when check fails and 0 otherwise. The negative value depends on the
387 * reason: -ENODATA for bad header, -EBADR for broadcast destination or source,
388 * and -EREMOTE for non-local (other host) destination.
389 */
Antonio Quartullife8a93b2013-04-03 19:10:26 +0200390static int batadv_check_unicast_packet(struct batadv_priv *bat_priv,
391 struct sk_buff *skb, int hdr_size)
Martin Hundebøllff51fd72012-07-05 11:34:27 +0200392{
393 struct ethhdr *ethhdr;
394
395 /* drop packet if it has not necessary minimum size */
396 if (unlikely(!pskb_may_pull(skb, hdr_size)))
Martin Hundebøllf86ce0a2013-01-14 00:20:32 +0100397 return -ENODATA;
Martin Hundebøllff51fd72012-07-05 11:34:27 +0200398
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200399 ethhdr = eth_hdr(skb);
Martin Hundebøllff51fd72012-07-05 11:34:27 +0200400
401 /* packet with unicast indication but broadcast recipient */
402 if (is_broadcast_ether_addr(ethhdr->h_dest))
Martin Hundebøllf86ce0a2013-01-14 00:20:32 +0100403 return -EBADR;
Martin Hundebøllff51fd72012-07-05 11:34:27 +0200404
405 /* packet with broadcast sender address */
406 if (is_broadcast_ether_addr(ethhdr->h_source))
Martin Hundebøllf86ce0a2013-01-14 00:20:32 +0100407 return -EBADR;
Martin Hundebøllff51fd72012-07-05 11:34:27 +0200408
409 /* not for me */
Antonio Quartullife8a93b2013-04-03 19:10:26 +0200410 if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
Martin Hundebøllf86ce0a2013-01-14 00:20:32 +0100411 return -EREMOTE;
Martin Hundebøllff51fd72012-07-05 11:34:27 +0200412
413 return 0;
414}
415
Simon Wunderlichf6c8b712013-11-13 19:14:45 +0100416/**
417 * batadv_find_router - find a suitable router for this originator
418 * @bat_priv: the bat priv with all the soft interface information
419 * @orig_node: the destination node
420 * @recv_if: pointer to interface this packet was received on
421 *
422 * Returns the router which should be used for this orig_node on
423 * this interface, or NULL if not available.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200424 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200425struct batadv_neigh_node *
426batadv_find_router(struct batadv_priv *bat_priv,
427 struct batadv_orig_node *orig_node,
Simon Wunderlichf3b3d902013-11-13 19:14:50 +0100428 struct batadv_hard_iface *recv_if)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000429{
Simon Wunderlichf3b3d902013-11-13 19:14:50 +0100430 struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
431 struct batadv_neigh_node *first_candidate_router = NULL;
432 struct batadv_neigh_node *next_candidate_router = NULL;
433 struct batadv_neigh_node *router, *cand_router = NULL;
434 struct batadv_neigh_node *last_cand_router = NULL;
435 struct batadv_orig_ifinfo *cand, *first_candidate = NULL;
436 struct batadv_orig_ifinfo *next_candidate = NULL;
437 struct batadv_orig_ifinfo *last_candidate;
438 bool last_candidate_found = false;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000439
440 if (!orig_node)
441 return NULL;
442
Simon Wunderlich7351a4822013-11-13 19:14:47 +0100443 router = batadv_orig_router_get(orig_node, recv_if);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000444
Simon Wunderlich329887a2014-08-13 14:26:56 +0200445 if (!router)
446 return router;
447
Simon Wunderlichf3b3d902013-11-13 19:14:50 +0100448 /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop)
449 * and if activated.
450 */
Simon Wunderlich329887a2014-08-13 14:26:56 +0200451 if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding)))
Simon Wunderlichf3b3d902013-11-13 19:14:50 +0100452 return router;
453
454 /* bonding: loop through the list of possible routers found
455 * for the various outgoing interfaces and find a candidate after
456 * the last chosen bonding candidate (next_candidate). If no such
457 * router is found, use the first candidate found (the previously
458 * chosen bonding candidate might have been the last one in the list).
Antonio Quartulli3f687852014-11-02 11:29:56 +0100459 * If this can't be found either, return the previously chosen
Simon Wunderlichf3b3d902013-11-13 19:14:50 +0100460 * router - obviously there are no other candidates.
461 */
462 rcu_read_lock();
463 last_candidate = orig_node->last_bonding_candidate;
464 if (last_candidate)
465 last_cand_router = rcu_dereference(last_candidate->router);
466
467 hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) {
468 /* acquire some structures and references ... */
469 if (!atomic_inc_not_zero(&cand->refcount))
470 continue;
471
472 cand_router = rcu_dereference(cand->router);
473 if (!cand_router)
474 goto next;
475
476 if (!atomic_inc_not_zero(&cand_router->refcount)) {
477 cand_router = NULL;
478 goto next;
479 }
480
481 /* alternative candidate should be good enough to be
482 * considered
483 */
484 if (!bao->bat_neigh_is_equiv_or_better(cand_router,
485 cand->if_outgoing,
486 router, recv_if))
487 goto next;
488
489 /* don't use the same router twice */
490 if (last_cand_router == cand_router)
491 goto next;
492
493 /* mark the first possible candidate */
494 if (!first_candidate) {
495 atomic_inc(&cand_router->refcount);
496 atomic_inc(&cand->refcount);
497 first_candidate = cand;
498 first_candidate_router = cand_router;
499 }
500
501 /* check if the loop has already passed the previously selected
502 * candidate ... this function should select the next candidate
503 * AFTER the previously used bonding candidate.
504 */
505 if (!last_candidate || last_candidate_found) {
506 next_candidate = cand;
507 next_candidate_router = cand_router;
508 break;
509 }
510
511 if (last_candidate == cand)
512 last_candidate_found = true;
513next:
514 /* free references */
515 if (cand_router) {
516 batadv_neigh_node_free_ref(cand_router);
517 cand_router = NULL;
518 }
519 batadv_orig_ifinfo_free_ref(cand);
520 }
521 rcu_read_unlock();
522
523 /* last_bonding_candidate is reset below, remove the old reference. */
524 if (orig_node->last_bonding_candidate)
525 batadv_orig_ifinfo_free_ref(orig_node->last_bonding_candidate);
526
527 /* After finding candidates, handle the three cases:
528 * 1) there is a next candidate, use that
529 * 2) there is no next candidate, use the first of the list
530 * 3) there is no candidate at all, return the default router
531 */
532 if (next_candidate) {
533 batadv_neigh_node_free_ref(router);
534
535 /* remove references to first candidate, we don't need it. */
536 if (first_candidate) {
537 batadv_neigh_node_free_ref(first_candidate_router);
538 batadv_orig_ifinfo_free_ref(first_candidate);
539 }
540 router = next_candidate_router;
541 orig_node->last_bonding_candidate = next_candidate;
542 } else if (first_candidate) {
543 batadv_neigh_node_free_ref(router);
544
545 /* refcounting has already been done in the loop above. */
546 router = first_candidate_router;
547 orig_node->last_bonding_candidate = first_candidate;
548 } else {
549 orig_node->last_bonding_candidate = NULL;
550 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000551
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000552 return router;
553}
554
Sven Eckelmann63b01032012-05-16 20:23:13 +0200555static int batadv_route_unicast_packet(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200556 struct batadv_hard_iface *recv_if)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000557{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200558 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
559 struct batadv_orig_node *orig_node = NULL;
Sven Eckelmann96412692012-06-05 22:31:30 +0200560 struct batadv_unicast_packet *unicast_packet;
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200561 struct ethhdr *ethhdr = eth_hdr(skb);
Simon Wunderlichc54f38c2013-07-29 17:56:44 +0200562 int res, hdr_len, ret = NET_RX_DROP;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000563
Sven Eckelmann96412692012-06-05 22:31:30 +0200564 unicast_packet = (struct batadv_unicast_packet *)skb->data;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000565
566 /* TTL exceeded */
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100567 if (unicast_packet->ttl < 2) {
Sven Eckelmann86ceb362012-03-07 09:07:45 +0100568 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
569 ethhdr->h_source, unicast_packet->dest);
Marek Lindner44524fc2011-02-10 14:33:53 +0000570 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000571 }
572
573 /* get routing information */
Sven Eckelmannda641192012-05-12 13:48:56 +0200574 orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest);
Marek Lindner7aadf882011-02-18 12:28:09 +0000575
Marek Lindner44524fc2011-02-10 14:33:53 +0000576 if (!orig_node)
Antonio Quartullib5a6f692011-04-16 11:30:57 +0200577 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000578
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000579 /* create a copy of the skb, if needed, to modify it. */
Antonio Quartulli0d125072012-02-18 11:27:34 +0100580 if (skb_cow(skb, ETH_HLEN) < 0)
Marek Lindner44524fc2011-02-10 14:33:53 +0000581 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000582
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000583 /* decrement ttl */
Martin Hundebøllf097e252013-05-23 16:53:01 +0200584 unicast_packet = (struct batadv_unicast_packet *)skb->data;
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100585 unicast_packet->ttl--;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000586
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100587 switch (unicast_packet->packet_type) {
Simon Wunderlichc54f38c2013-07-29 17:56:44 +0200588 case BATADV_UNICAST_4ADDR:
589 hdr_len = sizeof(struct batadv_unicast_4addr_packet);
590 break;
591 case BATADV_UNICAST:
592 hdr_len = sizeof(struct batadv_unicast_packet);
593 break;
594 default:
595 /* other packet types not supported - yet */
596 hdr_len = -1;
597 break;
598 }
599
600 if (hdr_len > 0)
601 batadv_skb_set_priority(skb, hdr_len);
602
Martin Hundebølle91ecfc2013-04-20 13:54:39 +0200603 res = batadv_send_skb_to_orig(skb, orig_node, recv_if);
Martin Hundebøll95332472013-01-25 11:12:40 +0100604
Martin Hundebølle91ecfc2013-04-20 13:54:39 +0200605 /* translate transmit result into receive result */
606 if (res == NET_XMIT_SUCCESS) {
607 /* skb was transmitted and consumed */
Martin Hundebøll95332472013-01-25 11:12:40 +0100608 batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
609 batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
610 skb->len + ETH_HLEN);
Martin Hundebølle91ecfc2013-04-20 13:54:39 +0200611
612 ret = NET_RX_SUCCESS;
613 } else if (res == NET_XMIT_POLICED) {
614 /* skb was buffered and consumed */
615 ret = NET_RX_SUCCESS;
Martin Hundebøll95332472013-01-25 11:12:40 +0100616 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000617
Marek Lindner44524fc2011-02-10 14:33:53 +0000618out:
Marek Lindner44524fc2011-02-10 14:33:53 +0000619 if (orig_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200620 batadv_orig_node_free_ref(orig_node);
Marek Lindner44524fc2011-02-10 14:33:53 +0000621 return ret;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000622}
623
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200624/**
625 * batadv_reroute_unicast_packet - update the unicast header for re-routing
626 * @bat_priv: the bat priv with all the soft interface information
627 * @unicast_packet: the unicast header to be updated
628 * @dst_addr: the payload destination
Antonio Quartullic018ad32013-06-04 12:11:39 +0200629 * @vid: VLAN identifier
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200630 *
631 * Search the translation table for dst_addr and update the unicast header with
632 * the new corresponding information (originator address where the destination
633 * client currently is and its known TTVN)
634 *
635 * Returns true if the packet header has been updated, false otherwise
636 */
637static bool
638batadv_reroute_unicast_packet(struct batadv_priv *bat_priv,
639 struct batadv_unicast_packet *unicast_packet,
Antonio Quartullic018ad32013-06-04 12:11:39 +0200640 uint8_t *dst_addr, unsigned short vid)
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200641{
642 struct batadv_orig_node *orig_node = NULL;
643 struct batadv_hard_iface *primary_if = NULL;
644 bool ret = false;
645 uint8_t *orig_addr, orig_ttvn;
646
Antonio Quartullic018ad32013-06-04 12:11:39 +0200647 if (batadv_is_my_client(bat_priv, dst_addr, vid)) {
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200648 primary_if = batadv_primary_if_get_selected(bat_priv);
649 if (!primary_if)
650 goto out;
651 orig_addr = primary_if->net_dev->dev_addr;
652 orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
653 } else {
Antonio Quartullic018ad32013-06-04 12:11:39 +0200654 orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr,
655 vid);
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200656 if (!orig_node)
657 goto out;
658
659 if (batadv_compare_eth(orig_node->orig, unicast_packet->dest))
660 goto out;
661
662 orig_addr = orig_node->orig;
663 orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
664 }
665
666 /* update the packet header */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100667 ether_addr_copy(unicast_packet->dest, orig_addr);
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200668 unicast_packet->ttvn = orig_ttvn;
669
670 ret = true;
671out:
672 if (primary_if)
673 batadv_hardif_free_ref(primary_if);
674 if (orig_node)
675 batadv_orig_node_free_ref(orig_node);
676
677 return ret;
678}
679
Sven Eckelmann56303d32012-06-05 22:31:31 +0200680static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
Antonio Quartullidd981ab2013-04-03 10:14:20 +0200681 struct sk_buff *skb, int hdr_len) {
Sven Eckelmann96412692012-06-05 22:31:30 +0200682 struct batadv_unicast_packet *unicast_packet;
Antonio Quartullic018ad32013-06-04 12:11:39 +0200683 struct batadv_hard_iface *primary_if;
684 struct batadv_orig_node *orig_node;
685 uint8_t curr_ttvn, old_ttvn;
686 struct ethhdr *ethhdr;
687 unsigned short vid;
Sven Eckelmann3e348192012-05-16 20:23:22 +0200688 int is_old_ttvn;
Antonio Quartullia73105b2011-04-27 14:27:44 +0200689
Antonio Quartullib8fcfa42012-08-26 23:25:59 +0200690 /* check if there is enough data before accessing it */
Antonio Quartullif1791422014-01-30 00:12:24 +0100691 if (!pskb_may_pull(skb, hdr_len + ETH_HLEN))
Antonio Quartullib8fcfa42012-08-26 23:25:59 +0200692 return 0;
693
694 /* create a copy of the skb (in case of for re-routing) to modify it. */
695 if (skb_cow(skb, sizeof(*unicast_packet)) < 0)
Antonio Quartullia73105b2011-04-27 14:27:44 +0200696 return 0;
697
Sven Eckelmann96412692012-06-05 22:31:30 +0200698 unicast_packet = (struct batadv_unicast_packet *)skb->data;
Antonio Quartullic018ad32013-06-04 12:11:39 +0200699 vid = batadv_get_vid(skb, hdr_len);
Antonio Quartullidd981ab2013-04-03 10:14:20 +0200700 ethhdr = (struct ethhdr *)(skb->data + hdr_len);
Antonio Quartullia73105b2011-04-27 14:27:44 +0200701
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200702 /* check if the destination client was served by this node and it is now
703 * roaming. In this case, it means that the node has got a ROAM_ADV
704 * message and that it knows the new destination in the mesh to re-route
705 * the packet to
706 */
Antonio Quartullic018ad32013-06-04 12:11:39 +0200707 if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) {
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200708 if (batadv_reroute_unicast_packet(bat_priv, unicast_packet,
Antonio Quartullic018ad32013-06-04 12:11:39 +0200709 ethhdr->h_dest, vid))
André Gaul23c4ec12014-06-10 17:50:31 +0200710 batadv_dbg_ratelimited(BATADV_DBG_TT,
711 bat_priv,
712 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
713 unicast_packet->dest,
714 ethhdr->h_dest);
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200715 /* at this point the mesh destination should have been
716 * substituted with the originator address found in the global
717 * table. If not, let the packet go untouched anyway because
718 * there is nothing the node can do
719 */
720 return 1;
721 }
722
723 /* retrieve the TTVN known by this node for the packet destination. This
724 * value is used later to check if the node which sent (or re-routed
725 * last time) the packet had an updated information or not
726 */
727 curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
Antonio Quartullife8a93b2013-04-03 19:10:26 +0200728 if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
Sven Eckelmannda641192012-05-12 13:48:56 +0200729 orig_node = batadv_orig_hash_find(bat_priv,
730 unicast_packet->dest);
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200731 /* if it is not possible to find the orig_node representing the
732 * destination, the packet can immediately be dropped as it will
733 * not be possible to deliver it
734 */
Antonio Quartullia73105b2011-04-27 14:27:44 +0200735 if (!orig_node)
736 return 0;
737
738 curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200739 batadv_orig_node_free_ref(orig_node);
Antonio Quartullia73105b2011-04-27 14:27:44 +0200740 }
741
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200742 /* check if the TTVN contained in the packet is fresher than what the
743 * node knows
744 */
Sven Eckelmann3e348192012-05-16 20:23:22 +0200745 is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn);
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200746 if (!is_old_ttvn)
747 return 1;
Antonio Quartullia73105b2011-04-27 14:27:44 +0200748
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200749 old_ttvn = unicast_packet->ttvn;
750 /* the packet was forged based on outdated network information. Its
751 * destination can possibly be updated and forwarded towards the new
752 * target host
753 */
754 if (batadv_reroute_unicast_packet(bat_priv, unicast_packet,
Antonio Quartullic018ad32013-06-04 12:11:39 +0200755 ethhdr->h_dest, vid)) {
André Gaul23c4ec12014-06-10 17:50:31 +0200756 batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv,
757 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
758 unicast_packet->dest, ethhdr->h_dest,
759 old_ttvn, curr_ttvn);
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200760 return 1;
Antonio Quartullia73105b2011-04-27 14:27:44 +0200761 }
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200762
763 /* the packet has not been re-routed: either the destination is
764 * currently served by this node or there is no destination at all and
765 * it is possible to drop the packet
766 */
Antonio Quartullic018ad32013-06-04 12:11:39 +0200767 if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid))
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200768 return 0;
769
770 /* update the header in order to let the packet be delivered to this
771 * node's soft interface
772 */
773 primary_if = batadv_primary_if_get_selected(bat_priv);
774 if (!primary_if)
775 return 0;
776
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100777 ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr);
Antonio Quartulli7c1fd912012-09-23 22:38:34 +0200778
779 batadv_hardif_free_ref(primary_if);
780
781 unicast_packet->ttvn = curr_ttvn;
782
Antonio Quartullia73105b2011-04-27 14:27:44 +0200783 return 1;
784}
785
Simon Wunderlicha1f1ac52013-04-25 10:37:23 +0200786/**
787 * batadv_recv_unhandled_unicast_packet - receive and process packets which
788 * are in the unicast number space but not yet known to the implementation
789 * @skb: unicast tvlv packet to process
790 * @recv_if: pointer to interface this packet was received on
791 *
792 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
793 * otherwise.
794 */
795int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb,
796 struct batadv_hard_iface *recv_if)
797{
798 struct batadv_unicast_packet *unicast_packet;
799 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
800 int check, hdr_size = sizeof(*unicast_packet);
801
802 check = batadv_check_unicast_packet(bat_priv, skb, hdr_size);
803 if (check < 0)
804 return NET_RX_DROP;
805
806 /* we don't know about this type, drop it. */
807 unicast_packet = (struct batadv_unicast_packet *)skb->data;
808 if (batadv_is_my_mac(bat_priv, unicast_packet->dest))
809 return NET_RX_DROP;
810
811 return batadv_route_unicast_packet(skb, recv_if);
812}
813
Sven Eckelmann56303d32012-06-05 22:31:31 +0200814int batadv_recv_unicast_packet(struct sk_buff *skb,
815 struct batadv_hard_iface *recv_if)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000816{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200817 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
Sven Eckelmann96412692012-06-05 22:31:30 +0200818 struct batadv_unicast_packet *unicast_packet;
Martin Hundebøll4046b242012-04-20 17:02:45 +0200819 struct batadv_unicast_4addr_packet *unicast_4addr_packet;
Antonio Quartulli9affec62012-10-14 17:19:19 +0200820 uint8_t *orig_addr;
821 struct batadv_orig_node *orig_node = NULL;
Martin Hundebøll612d2b42013-01-25 11:12:42 +0100822 int check, hdr_size = sizeof(*unicast_packet);
Antonio Quartullic384ea32011-06-26 03:37:18 +0200823 bool is4addr;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000824
Antonio Quartulli7cdcf6d2012-10-01 09:57:35 +0200825 unicast_packet = (struct batadv_unicast_packet *)skb->data;
Martin Hundebøll4046b242012-04-20 17:02:45 +0200826 unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
Antonio Quartulli7cdcf6d2012-10-01 09:57:35 +0200827
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100828 is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR;
Antonio Quartulli7cdcf6d2012-10-01 09:57:35 +0200829 /* the caller function should have already pulled 2 bytes */
Antonio Quartullic384ea32011-06-26 03:37:18 +0200830 if (is4addr)
Martin Hundebøll4046b242012-04-20 17:02:45 +0200831 hdr_size = sizeof(*unicast_4addr_packet);
Antonio Quartulli7cdcf6d2012-10-01 09:57:35 +0200832
Martin Hundebøll612d2b42013-01-25 11:12:42 +0100833 /* function returns -EREMOTE for promiscuous packets */
David S. Miller6e0895c2013-04-22 20:32:51 -0400834 check = batadv_check_unicast_packet(bat_priv, skb, hdr_size);
Martin Hundebøll612d2b42013-01-25 11:12:42 +0100835
836 /* Even though the packet is not for us, we might save it to use for
837 * decoding a later received coded packet
838 */
839 if (check == -EREMOTE)
840 batadv_nc_skb_store_sniffed_unicast(bat_priv, skb);
841
842 if (check < 0)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000843 return NET_RX_DROP;
Antonio Quartullidd981ab2013-04-03 10:14:20 +0200844 if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size))
Antonio Quartullia73105b2011-04-27 14:27:44 +0200845 return NET_RX_DROP;
846
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000847 /* packet for me */
Antonio Quartullife8a93b2013-04-03 19:10:26 +0200848 if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
Antonio Quartulli9affec62012-10-14 17:19:19 +0200849 if (is4addr) {
Martin Hundebøll4046b242012-04-20 17:02:45 +0200850 batadv_dat_inc_counter(bat_priv,
851 unicast_4addr_packet->subtype);
Antonio Quartulli9affec62012-10-14 17:19:19 +0200852 orig_addr = unicast_4addr_packet->src;
853 orig_node = batadv_orig_hash_find(bat_priv, orig_addr);
854 }
Martin Hundebøll4046b242012-04-20 17:02:45 +0200855
Antonio Quartullic384ea32011-06-26 03:37:18 +0200856 if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb,
857 hdr_size))
858 goto rx_success;
859 if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb,
860 hdr_size))
861 goto rx_success;
862
Antonio Quartulli37135172012-07-05 23:38:30 +0200863 batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size,
Antonio Quartulli9affec62012-10-14 17:19:19 +0200864 orig_node);
Antonio Quartulli37135172012-07-05 23:38:30 +0200865
Antonio Quartullic384ea32011-06-26 03:37:18 +0200866rx_success:
Antonio Quartulli9affec62012-10-14 17:19:19 +0200867 if (orig_node)
868 batadv_orig_node_free_ref(orig_node);
869
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000870 return NET_RX_SUCCESS;
871 }
872
Sven Eckelmann63b01032012-05-16 20:23:13 +0200873 return batadv_route_unicast_packet(skb, recv_if);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000874}
875
Marek Lindneref261572013-04-23 21:39:57 +0800876/**
877 * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
878 * @skb: unicast tvlv packet to process
879 * @recv_if: pointer to interface this packet was received on
880 * @dst_addr: the payload destination
881 *
882 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
883 * otherwise.
884 */
885int batadv_recv_unicast_tvlv(struct sk_buff *skb,
886 struct batadv_hard_iface *recv_if)
887{
888 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
889 struct batadv_unicast_tvlv_packet *unicast_tvlv_packet;
890 unsigned char *tvlv_buff;
891 uint16_t tvlv_buff_len;
892 int hdr_size = sizeof(*unicast_tvlv_packet);
893 int ret = NET_RX_DROP;
894
895 if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
896 return NET_RX_DROP;
897
898 /* the header is likely to be modified while forwarding */
899 if (skb_cow(skb, hdr_size) < 0)
900 return NET_RX_DROP;
901
902 /* packet needs to be linearized to access the tvlv content */
903 if (skb_linearize(skb) < 0)
904 return NET_RX_DROP;
905
906 unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data;
907
908 tvlv_buff = (unsigned char *)(skb->data + hdr_size);
909 tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len);
910
911 if (tvlv_buff_len > skb->len - hdr_size)
912 return NET_RX_DROP;
913
914 ret = batadv_tvlv_containers_process(bat_priv, false, NULL,
915 unicast_tvlv_packet->src,
916 unicast_tvlv_packet->dst,
917 tvlv_buff, tvlv_buff_len);
918
919 if (ret != NET_RX_SUCCESS)
920 ret = batadv_route_unicast_packet(skb, recv_if);
Antonio Quartulli05c3c8a2014-02-11 17:05:07 +0100921 else
922 consume_skb(skb);
Marek Lindneref261572013-04-23 21:39:57 +0800923
924 return ret;
925}
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000926
Martin Hundebøll610bfc6bc2013-05-23 16:53:02 +0200927/**
928 * batadv_recv_frag_packet - process received fragment
929 * @skb: the received fragment
930 * @recv_if: interface that the skb is received on
931 *
932 * This function does one of the three following things: 1) Forward fragment, if
933 * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
934 * lack further fragments; 3) Merge fragments, if we have all needed parts.
935 *
936 * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
937 */
938int batadv_recv_frag_packet(struct sk_buff *skb,
939 struct batadv_hard_iface *recv_if)
940{
941 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
942 struct batadv_orig_node *orig_node_src = NULL;
943 struct batadv_frag_packet *frag_packet;
944 int ret = NET_RX_DROP;
945
946 if (batadv_check_unicast_packet(bat_priv, skb,
947 sizeof(*frag_packet)) < 0)
948 goto out;
949
950 frag_packet = (struct batadv_frag_packet *)skb->data;
951 orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig);
952 if (!orig_node_src)
953 goto out;
954
955 /* Route the fragment if it is not for us and too big to be merged. */
956 if (!batadv_is_my_mac(bat_priv, frag_packet->dest) &&
957 batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) {
958 ret = NET_RX_SUCCESS;
959 goto out;
960 }
961
962 batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX);
963 batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len);
964
965 /* Add fragment to buffer and merge if possible. */
966 if (!batadv_frag_skb_buffer(&skb, orig_node_src))
967 goto out;
968
969 /* Deliver merged packet to the appropriate handler, if it was
970 * merged
971 */
972 if (skb)
973 batadv_batman_skb_recv(skb, recv_if->net_dev,
974 &recv_if->batman_adv_ptype, NULL);
975
976 ret = NET_RX_SUCCESS;
977
978out:
979 if (orig_node_src)
980 batadv_orig_node_free_ref(orig_node_src);
981
982 return ret;
983}
984
Sven Eckelmann56303d32012-06-05 22:31:31 +0200985int batadv_recv_bcast_packet(struct sk_buff *skb,
986 struct batadv_hard_iface *recv_if)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000987{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200988 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
989 struct batadv_orig_node *orig_node = NULL;
Sven Eckelmann96412692012-06-05 22:31:30 +0200990 struct batadv_bcast_packet *bcast_packet;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000991 struct ethhdr *ethhdr;
Sven Eckelmann704509b2011-05-14 23:14:54 +0200992 int hdr_size = sizeof(*bcast_packet);
Marek Lindnerf3e00082011-01-25 21:52:11 +0000993 int ret = NET_RX_DROP;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000994 int32_t seq_diff;
Antonio Quartulli3fba7322013-10-13 02:50:17 +0200995 uint32_t seqno;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000996
997 /* drop packet if it has not necessary minimum size */
998 if (unlikely(!pskb_may_pull(skb, hdr_size)))
Marek Lindnerf3e00082011-01-25 21:52:11 +0000999 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001000
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001001 ethhdr = eth_hdr(skb);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001002
1003 /* packet with broadcast indication but unicast recipient */
1004 if (!is_broadcast_ether_addr(ethhdr->h_dest))
Marek Lindnerf3e00082011-01-25 21:52:11 +00001005 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001006
1007 /* packet with broadcast sender address */
1008 if (is_broadcast_ether_addr(ethhdr->h_source))
Marek Lindnerf3e00082011-01-25 21:52:11 +00001009 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001010
1011 /* ignore broadcasts sent by myself */
Antonio Quartullife8a93b2013-04-03 19:10:26 +02001012 if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
Marek Lindnerf3e00082011-01-25 21:52:11 +00001013 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001014
Sven Eckelmann96412692012-06-05 22:31:30 +02001015 bcast_packet = (struct batadv_bcast_packet *)skb->data;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001016
1017 /* ignore broadcasts originated by myself */
Antonio Quartullife8a93b2013-04-03 19:10:26 +02001018 if (batadv_is_my_mac(bat_priv, bcast_packet->orig))
Marek Lindnerf3e00082011-01-25 21:52:11 +00001019 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001020
Simon Wunderlicha40d9b02013-12-02 20:38:31 +01001021 if (bcast_packet->ttl < 2)
Marek Lindnerf3e00082011-01-25 21:52:11 +00001022 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001023
Sven Eckelmannda641192012-05-12 13:48:56 +02001024 orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig);
Marek Lindnerf3e00082011-01-25 21:52:11 +00001025
1026 if (!orig_node)
Antonio Quartullib5a6f692011-04-16 11:30:57 +02001027 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001028
Marek Lindnerf3e00082011-01-25 21:52:11 +00001029 spin_lock_bh(&orig_node->bcast_seqno_lock);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001030
Antonio Quartulli3fba7322013-10-13 02:50:17 +02001031 seqno = ntohl(bcast_packet->seqno);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001032 /* check whether the packet is a duplicate */
Sven Eckelmann9b4a1152012-05-12 13:48:53 +02001033 if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno,
Antonio Quartulli3fba7322013-10-13 02:50:17 +02001034 seqno))
Marek Lindnerf3e00082011-01-25 21:52:11 +00001035 goto spin_unlock;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001036
Antonio Quartulli3fba7322013-10-13 02:50:17 +02001037 seq_diff = seqno - orig_node->last_bcast_seqno;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001038
1039 /* check whether the packet is old and the host just restarted. */
Sven Eckelmann30d3c512012-05-12 02:09:36 +02001040 if (batadv_window_protected(bat_priv, seq_diff,
1041 &orig_node->bcast_seqno_reset))
Marek Lindnerf3e00082011-01-25 21:52:11 +00001042 goto spin_unlock;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001043
1044 /* mark broadcast in flood history, update window position
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001045 * if required.
1046 */
Sven Eckelmann0f5f9322012-05-12 02:09:25 +02001047 if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
Antonio Quartulli3fba7322013-10-13 02:50:17 +02001048 orig_node->last_bcast_seqno = seqno;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001049
Marek Lindnerf3e00082011-01-25 21:52:11 +00001050 spin_unlock_bh(&orig_node->bcast_seqno_lock);
Marek Lindnerf3e00082011-01-25 21:52:11 +00001051
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001052 /* check whether this has been sent by another originator before */
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001053 if (batadv_bla_check_bcast_duplist(bat_priv, skb))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001054 goto out;
1055
Simon Wunderlichc54f38c2013-07-29 17:56:44 +02001056 batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet));
1057
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001058 /* rebroadcast packet */
Sven Eckelmann9455e342012-05-12 02:09:37 +02001059 batadv_add_bcast_packet_to_list(bat_priv, skb, 1);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001060
Simon Wunderlich23721382012-01-22 20:00:19 +01001061 /* don't hand the broadcast up if it is from an originator
1062 * from the same backbone.
1063 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001064 if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size))
Simon Wunderlich23721382012-01-22 20:00:19 +01001065 goto out;
1066
Antonio Quartullic384ea32011-06-26 03:37:18 +02001067 if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size))
1068 goto rx_success;
1069 if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size))
1070 goto rx_success;
1071
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001072 /* broadcast for me */
Antonio Quartulli37135172012-07-05 23:38:30 +02001073 batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size,
1074 orig_node);
Antonio Quartullic384ea32011-06-26 03:37:18 +02001075
1076rx_success:
Marek Lindnerf3e00082011-01-25 21:52:11 +00001077 ret = NET_RX_SUCCESS;
1078 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001079
Marek Lindnerf3e00082011-01-25 21:52:11 +00001080spin_unlock:
1081 spin_unlock_bh(&orig_node->bcast_seqno_lock);
Marek Lindnerf3e00082011-01-25 21:52:11 +00001082out:
1083 if (orig_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +02001084 batadv_orig_node_free_ref(orig_node);
Marek Lindnerf3e00082011-01-25 21:52:11 +00001085 return ret;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001086}